{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-50152","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-10-21T19:36:19.959Z","datePublished":"2024-11-07T09:31:28.733Z","dateUpdated":"2026-08-05T11:42:06.009Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:42:06.009Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix possible double free in smb2_set_ea()\n\nClang static checker(scan-build) warning：\nfs/smb/client/smb2ops.c:1304:2: Attempt to free released memory.\n 1304 |         kfree(ea);\n      |         ^~~~~~~~~\n\nThere is a double free in such case:\n'ea is initialized to NULL' -> 'first successful memory allocation for\nea' -> 'something failed, goto sea_exit' -> 'first memory release for ea'\n-> 'goto replay_again' -> 'second goto sea_exit before allocate memory\nfor ea' -> 'second memory release for ea resulted in double free'.\n\nRe-initialie 'ea' to NULL near to the replay_again label, it can fix this\ndouble free problem."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - The bug is driven entirely by data from a remote SMB peer over TCP/445 — the server induces the replay by resetting the connection (`-EAGAIN`) and then returns `STATUS_NO_EAS_ON_FILE`/an oversized `OutputBufferLength` to force the early `sea_exit` on the retry. A compromised file server or an on-path attacker spoofing SMB responses reaches it with no local access.\nAC:L - The malicious server deterministically controls both halves of the sequence — dropping the TCP connection mid-request and crafting the QUERY_INFO reply on the replay — needing only two round trips, with no race or memory-layout condition outside its control. Mounted shares see routine xattr traffic from backup, archive, and desktop-metadata tooling.\nPR:N - A malicious or compromised SMB server holds no privileges whatsoever on the victim client, and nothing on the code path checks server trust. Even in a purely local framing, only ordinary write access to a file on the share is needed.\nUI:N - No victim action is required at exploitation time — the mount is already established via fstab/autofs/systemd, and the setxattr/removexattr that enters `smb2_set_ea()` is generated by ordinary background activity such as `rsync -X`, `cp -a`, `tar --xattrs`, or indexing daemons.\nS:U - The double free corrupts the kernel slab allocator within the same security authority as the vulnerable code; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The second `kfree()` releases a chunk that has almost certainly been reallocated to another live kernel object, producing a use-after-free with two owners; the attacker-chosen allocation size enables grooming into a targeted kmalloc cache and reading back arbitrary kernel data.\nI:H - Double-free/UAF of an attacker-sized slab object is the canonical primitive for heap spraying and controlled overwrite of an adjacent or aliased structure, giving arbitrary write and control-flow hijack potential.\nA:H - Even unexploited, the double free triggers slab freelist corruption or an immediate `BUG()` under `CONFIG_SLAB_FREELIST_HARDENED`, causing a kernel oops/panic that is remotely and repeatably inducible by the server."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2ops.c"],"versions":[{"version":"433042a91f9373241307725b52de573933ffedbf","lessThan":"b1813c220b76f60b1727984794377c4aa849d4c1","status":"affected","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","lessThan":"c9f758ecf2562dfdd4adf12c22921b5de8366123","status":"affected","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","lessThan":"19ebc1e6cab334a8193398d4152deb76019b5d34","status":"affected","versionType":"git"},{"version":"6.6.32","lessThan":"6.6.59","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2ops.c"],"versions":[{"version":"6.8","status":"affected"},{"version":"0","lessThan":"6.8","status":"unaffected","versionType":"semver"},{"version":"6.6.59","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.11.6","lessThanOrEqual":"6.11.*","status":"unaffected","versionType":"semver"},{"version":"6.12","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.32","versionEndExcluding":"6.6.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.11.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.12"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b1813c220b76f60b1727984794377c4aa849d4c1"},{"url":"https://git.kernel.org/stable/c/c9f758ecf2562dfdd4adf12c22921b5de8366123"},{"url":"https://git.kernel.org/stable/c/19ebc1e6cab334a8193398d4152deb76019b5d34"}],"title":"smb: client: fix possible double free in smb2_set_ea()","x_generator":{"engine":"bippy-1.2.0"}}}}